ee5b6a2550
This allows runtimes in different packages (dockertools, rkt, kuberuntime) to share the same logic. Before this change, only dockertools support this feature. Now all three packages support image pull throttling.
80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package images
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import (
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"time"
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"k8s.io/kubernetes/pkg/api"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/util/wait"
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)
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type imagePuller interface {
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pullImage(kubecontainer.ImageSpec, []api.Secret, chan<- error)
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}
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var _, _ imagePuller = ¶llelImagePuller{}, &serialImagePuller{}
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type parallelImagePuller struct {
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imageService kubecontainer.ImageService
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}
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func newParallelImagePuller(imageService kubecontainer.ImageService) imagePuller {
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return ¶llelImagePuller{imageService}
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}
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func (pip *parallelImagePuller) pullImage(spec kubecontainer.ImageSpec, pullSecrets []api.Secret, errChan chan<- error) {
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go func() {
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errChan <- pip.imageService.PullImage(spec, pullSecrets)
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}()
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}
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// Maximum number of image pull requests than can be queued.
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const maxImagePullRequests = 10
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type serialImagePuller struct {
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imageService kubecontainer.ImageService
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pullRequests chan *imagePullRequest
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}
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func newSerialImagePuller(imageService kubecontainer.ImageService) imagePuller {
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imagePuller := &serialImagePuller{imageService, make(chan *imagePullRequest, maxImagePullRequests)}
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go wait.Until(imagePuller.processImagePullRequests, time.Second, wait.NeverStop)
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return imagePuller
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}
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type imagePullRequest struct {
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spec kubecontainer.ImageSpec
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pullSecrets []api.Secret
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errChan chan<- error
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}
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func (sip *serialImagePuller) pullImage(spec kubecontainer.ImageSpec, pullSecrets []api.Secret, errChan chan<- error) {
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sip.pullRequests <- &imagePullRequest{
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spec: spec,
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pullSecrets: pullSecrets,
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errChan: errChan,
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}
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}
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func (sip *serialImagePuller) processImagePullRequests() {
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for pullRequest := range sip.pullRequests {
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pullRequest.errChan <- sip.imageService.PullImage(pullRequest.spec, pullRequest.pullSecrets)
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}
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}
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